Laminating body

ABSTRACT

A laminating body for laminating a foil onto a substrate includes a pressure area on which there is imprinted a structure which forms an embossing in the foil upon lamination of the foil onto the substrate.

This invention relates to a laminating body for manufacturing laminate products by laminating a foil onto a substrate, and to a method for manufacturing such a laminating body and a method for manufacturing a laminate product by means of the laminating body.

Relevant laminate products in the present case are primarily value documents, identity and identification documents, chip cards or other card-shaped data carriers and value carriers or the like. The substrate can consist here of an almost arbitrary suitable material, e.g. of paper, plastic or the like.

It is known to provide a pressure area of laminating bodies employed upon lamination with a structure in the form of depressions by milling, etching or engraving, said structure being embossed into the laminated-on foil upon lamination and being perceptible in the resulting laminate product. Such embossings can serve e.g. as security features of the relevant value documents or data carrier and, as such, represent identifying information, hard-to-forge embossed patterns or the like.

The manufacturing of structured laminating bodies according to the specifications of a laminate product manufacturer by milling, etching or engraving requires elaborate production equipment and production steps, which must normally be carried out by a manufacturer of the laminating body within the framework of the production process. This not only causes high costs, but also results in relatively long production times and delivery times, which leads to a lack of flexibility and low reaction times for the laminate product manufacturer, in particular in the case of laminate products to be manufactured urgently. This method is likewise disadvantageous when only small batches of laminate products are to be manufactured, because this requires a frequent change of the laminating body solely due to changed embossed structures.

Therefore, it is the object of the present invention to optimize the structuring of a laminating body so as to avoid the disadvantages of the prior art.

This object is achieved by a laminating body and by methods according to the features of the independent claims. In the claims dependent thereon there are stated advantageous embodiments and developments of the invention.

According to the invention, a pressure area of the laminating body has an imprinted structure which is configured such that the structure incorporates into the foil upon lamination an embossing corresponding in mirror-image form to the structure. Accordingly, this structure, upon the manufacture of the laminating body, is imprinted on the pressure area thereof such that the structure, upon lamination of a foil onto a substrate, is embossed into the foil in mirror-image form.

The imprinted structure is, in so doing, applied sufficiently raised or thick that it is embossed into the foil upon lamination. Moreover, the structure is adequately hard and mechanically resistant. Also, the structure is imprinted on the pressure area such that upon lamination the structure does not adhere to the foil to be laminated on, but can be detached therefrom without damage and without residue. Further, the structure is sufficiently heat-resistant so as not to be damaged by a heating of the pressure area that might be required for lamination.

Imprinting the structure on the pressure area of the laminating body in accordance with the invention requires substantially less technical effort than, for example, milling or etching. Accordingly, the imprinting is substantially simpler and faster to realize, more flexible and more cost-efficient. The laminating body of the invention can also be printed with the structure outside elaborate production facilities and without high technical effort, e.g. by a laminate manufacturer, such as e.g. a manufacturer of value documents and identity documents, card-shaped data carriers or the like.

This leads, on the one hand, to a considerable saving of time and costs and thus to an elevated flexibility, which is of great importance in the case of individual requirements for laminate products to be produced, e.g. in the case of small batch sizes or urgent tenders for value documents or card-shaped data carriers. Finally, by imprinting the structures on site it can also be ensured that a laminating body manufacturer obtains no confidential information in connection with the embossed structures and their contents.

The laminating body may be in particular a laminating plate. Preferably, the laminating body consists of chromium steel which is preferably high-gloss on one or both sides, or of brass which is preferably nickel-plated or chromium-plated and particularly preferably is high-gloss on one or both sides.

The imprinted structure can represent in particular individualization data or personalization data of users of the laminate products to be manufactured, e.g. name and identity particulars in the case of national identity cards or other identity cards.

Besides this, in principle arbitrary information and embossed patterns and embossed structures can be embossed with the imprinted structure into the foils to be laminated on. Preferably, the structure forms in the foil upon lamination one or several of the following embossings:

-   -   images, such as e.g. country contours, logos, guilloche patterns         or the like;     -   alphanumeric characters, e.g. in the form of especially small         microcharacters or as braille;     -   aids for technical processing of the laminate product, in         particular markings, insertion fields, height compensation         fields and strip fields;     -   areas with defined roughness, in particular for representing the         above-mentioned images and markings;     -   Multiple Laser Images (MLI), i.e. areas with several small         lenses which produce an optical effect dependent on the viewing         direction.

Height compensation fields refer in this connection to those regions of the imprinted structure that can compensate fluctuations in thickness of the laminate product, e.g. due to an object inserted therein, e.g. an electronic component, in particular a display, a fabric band or the like. On the other hand, height compensation fields can also produce fluctuations in thickness of the laminate product which in turn compensate corresponding fluctuations in thickness of a further product into which the laminate product is incorporated (e.g. a passport, in particular a passport with a fabric band).

Imprinted areal structures with defined roughness can be in particular areas that are matt or smooth over the full area or partly. Preferably, there are provided in the imprinted structure matt areas with “negative” images in which the actual image is represented as smooth areas within the matt area.

The imprinted structure is preferably configured such that it forms a tactilely perceptible embossing in the foil upon lamination.

The structure is preferably imprinted on the pressure area by means of screen printing and/or offset printing and/or UV offset printing. Offset printing and UV offset printing are particularly suited for producing extremely fine microstructures, such as e.g. microcharacters, and height compensation fields. Particularly preferably, a standard screen printing process is employed.

For printing the structure on the pressure area there is particularly preferably employed a thermally stable lacquer, in particular a stoving lacquer, a UV lacquer or a tactile UV lacquer. Through the employment of a thermally stable lacquer, a long life of the imprinted structure is guaranteed when the foil is heated for lamination.

In a preferred embodiment, the structure is imprinted on the pressure area with a removable lacquer. In particular, the removable lacquer may be a lacquer that can be removed again with a special cleaner. After removal of the imprinted structure, another structure can be imprinted on the pressure area, i.e. the laminating body can be reused. This is particularly expedient when there is imprinted a structure with individual information which is to be embossed upon lamination only a few times.

In addition to the imprinted structures on the pressure areas of the laminating body, there can be provided further structures which are etched, milled or engraved. This can be expedient for example when milled, etched or engraved structures produce a largely standardized basic embossing and the printed structures make individual additions to this basic embossing, e.g. in the form of user- or batch-specific particulars, such as e.g. names, denominations or the like.

Further features and advantages of the invention will result from the following description of embodiment examples of the invention as well as further alternative embodiments in connection with the drawings, which show:

FIG. 1 schematically the steps of a method for imprinting a structure on a laminating body;

FIG. 2 schematically different laminating bodies with different imprinted structures as a sectional drawing;

FIG. 3 schematically the pressure area of a laminating body with different imprinted structures in plan view; and

FIG. 4 schematically two different laminating apparatuses.

FIG. 1 shows schematically the steps of a method for imprinting a structure on a laminating body 1 and subsequent employment of the laminating body 1 for lamination.

After the beginning SB of the method, a laminating body 1 is first made available in step S1 and optionally so prepared that it can subsequently be printed in step S2. The laminating body 1 can consist in principle of any sufficiently heat-resistant and stable material. In the present case there is employed a laminating body 1 of metal, preferably of chromium steel or brass or nickel-plated brass or chromium-plated brass. Particularly preferably, the laminating body of metal is high-gloss on one or both sides.

For preparing the imprinting, the laminating body 1 is optionally cleaned or polished. Also, there can be applied to the pressure area 2 of the laminating body 1 an adhesion promoter or another chemical substance that facilitates or makes possible the printing of the laminating body 1 in step S2. Subsequently, in step S2 the laminating body 1 is printed with a suitable printing substance such that the pressure area 2 of the laminating body 1 has an imprinted structure 3 which is so configured that it forms an embossing in the foil 51 upon lamination (cf. step S3).

In order for the imprinted structure 3 to effect an embossing in the foil 51 upon lamination, it is sufficiently raised relative to the pressure area 2. Moreover, the imprinted structure 3 is adequately hard or mechanically resistant and does not adhere to the laminated-on foil 51 after lamination, i.e. an adhesive connection that the structure 3 might enter into with the foil 51 upon lamination is significantly weaker than the connection of the structure 3 to the pressure area 2. If the foil 51 is heated by the laminating body 1 or in another way for lamination, the structure 3 is moreover adequately heat-resistant.

The structure 3 can be imprinted on the pressure area 2 in any suitable fashion. Preferably there is used therefor a screen printing, offset printing or UV offset printing process, e.g. a standard screen printing process. For printing the structure 3 there is employed a thermally stable lacquer, e.g. a stoving lacquer, a UV lacquer or a tactile UV lacquer. There can also be employed a lacquer that can be removed again e.g. only with a special cleaner.

Examples of possible designs of the imprinted structure 3 are represented in cross section in FIGS. 2 a to 2 d. The imprinted structure 3 a can be imprinted on the pressure area 2 over the full area and vary only in its height (FIG. 2 a). In so doing, there can be produced not only protruding structures 3 a, but also depressions relative to further imprinted structures 3 a.

The pressure area 2 represented in FIG. 2 b is provided only partly with wide 3 b and narrow 3 c protruding imprinted structures, while other regions of the pressure area 2 are not provided with imprinted structures 3 b, 3 c. The imprinted structures 3 b, 3 c here have different heights.

The pressure area 2 represented in FIG. 2 c is provided with an imprinted structure 3 d with defined roughness, an imprinted structure 3 e which upon lamination leaves an MLI (Multiple Laser Image) as an embossing, and a further structure 3 f varying in its height. In particular for producing an MLI 3 e, but also for producing arbitrary other structures 3 f varying in their height, a special relief lacquer can be employed. The structure 3 d with defined roughness leaves upon lamination an embossing appearing matt. This structure 3 d can have in particular an Rz value of 2-10 μm, whereby the Rz value states the areal roughness by means of the distance between the deepest valley and the highest peak of the rough area.

The pressure area 2 represented in FIG. 2 d is provided as in FIG. 2 b with wide protruding imprinted structures 3 b. In contrast to FIG. 2 b, however, the pressure area 2 represented here is additionally provided with depressions 4 which have been formed in the laminating body 1 by etching, milling or engraving and thus lie below the level of the pressure area 2.

The imprinted structures, as are represented by way of example in FIGS. 2 a to 2 d, typically have a height of 2 to 10 μm, but can also have any other height that is technically expedient and desired by a manufacturer of laminate products.

In FIG. 3 there is represented a pressure area 2 of a laminating body 1 which is provided with imprinted structures 3 which upon lamination leave embossings in the form of an image of the contour of a country 31, of an image of a guilloche pattern 36, of alphanumeric characters 32, of alphanumeric characters as braille 35, of a height compensation field 33, of an MLI 34 as well as of a marking 37 for technical processing of the laminate product. The alphanumeric characters 32, 35 here represent individualization and personalization data.

Further, there can also be provided images in the form of logos, alphanumeric characters in the form of microcharacters, aids for technical processing of the laminate product in the form of insertion fields and strip fields, or arbitrary other structures which can be produced in a foil 51 by embossing.

The structures 3 can also be provided in the form of areas with defined roughness, as described above in connection with FIG. 2 c, in particular for representing the above-mentioned images 31, 36 and markings 37. The areas with defined roughness can be in particular areas that are matt or smooth over the full area or partially. In particular, there can also be provided matt areas with “negative” images, in particular logos, i.e. the images are represented by smooth areas within the matt area.

The imprinted structures 3 can be configured partly or quite generally such that they produce a tactilely perceptible embossing upon lamination.

In the method step S3 of FIG. 1, a foil 51 is finally laminated onto an arbitrary substrate 52 to produce a laminate product 50. In so doing, the structures 3 imprinted on the laminating body are embossed into the foil 51, whereupon the method sequence represented in FIG. 1 finally ends SE.

The laminate product 50 may be, inter alia, a value document, a payment product, an identity and identification document, a chip card or another card-shaped data carrier and value carrier or the like. In particular, the laminate product 50 may also be a national identity card, a laminated page of a passport, a company ID card, a bank card, a credit card, a payment card (cash card), an insurance card, a membership card or the like.

In FIGS. 4 a and 4 b, possible laminating apparatuses are indicated. In the laminating apparatus of FIG. 4 a, the foil 51 is pressed with the pressure areas 2 of two laminating bodies 1 configured as plates onto the substrate 52. The laminating bodies 1 are provided on their pressure areas 2 with imprinted structures 3 which are embossed into the foil 51 during this process. Alternatively, only one of the laminating bodies 1 can of course also be provided on its pressure area 2 with an imprinted structure 3.

In order for the foil 51 to enter into an adhesive connection with the substrate 52, said foil is heated during compressing. Alternatively, self-adhesive foils 51 could also be employed, or an adhesive or adhesion promoter be applied to the foils 51 or the substrate 52. The substrate 52 can consist in particular of paper or plastic, and the foil 51 in particular of plastic.

In the laminating apparatus represented in FIG. 4 b, the laminating bodies 1 are configured as rollers with a circumferential pressure area 2. The foils 51 are thus rolled onto the substrate 52. In so doing, they are heated, through which the foils 51 enter into an adhesive connection with the substrate 52, and the laminate product 50 is produced. Simultaneously, the structures 3 imprinted on the pressure areas 2 are embossed into the foil 51. Alternatively, there can also be employed a self-adhesive foil 51 or an adhesion promoter. Likewise, only one of the laminating bodies 1 can also be provided on its pressure area 2 with an imprinted structure 3. The substrate 52 can consist in particular of paper or plastic, and the foil 51 in particular of plastic.

The imprinted structures 3 are shown in FIGS. 4 a and 4 b for representational reasons as regular, periodically recurring structures 3. In reality, the imprinted structures 3 are normally substantially more complex, as was described for example with reference to FIGS. 2 and 3. 

1.-15. (canceled)
 16. A laminating body for laminating a foil onto a substrate, comprising: a pressure area of the laminating body having an imprinted structure which is configured such that the structure forms an embossing in the foil upon lamination.
 17. The laminating body according to claim 16, wherein the laminating body comprises a laminating plate.
 18. The laminating body according to claim 16, wherein the imprinted structure represents individualization data or personalization data.
 19. The laminating body according to claim 16, wherein the imprinted structure is configured such that the structure forms in the foil upon lamination at least one embossing which is tactilely perceptible or represents at least one of a multiple laser image, an image, alphanumeric characters and an aid for technical processing of a laminate product formed upon lamination.
 20. The laminating body according to claim 16, wherein the structure is imprinted on the pressure area by means of screen printing or offset printing.
 21. The laminating body according to claim 16, wherein the structure is imprinted on the pressure area with a thermally stable lacquer.
 22. The laminating body according to claim 16, wherein the structure is imprinted on the pressure area with a removable lacquer.
 23. The laminating body according to claim 16, wherein the pressure area comprises at least one of an etched, milled, and engraved additional structure.
 24. A method for manufacturing a laminating body, comprising the steps: imprinting a structure on a pressure area of the laminating body such that the structure is embossed into the foil upon lamination of a foil onto a substrate.
 25. The method according to claim 24, wherein individualization data or personalization data are imprinted.
 26. The method according to claim 24, wherein the structure is imprinted such that the structure forms in the foil upon lamination at least one embossing which is tactilely perceptible or represents at least one of a multiple laser image, an image, alphanumeric characters and an aid for technical processing of a laminate product formed upon lamination.
 27. The method according to claim 24, wherein the structure is imprinted on the pressure area by screen printing or offset printing.
 28. The method according to claim 24, wherein the structure is imprinted on the pressure area with a thermally stable lacquer.
 29. The method according to claim 24, wherein the structure is imprinted on the pressure area with a removable lacquer.
 30. A method for manufacturing a laminate product comprising the steps: laminating a foil onto a substrate with the laminating body recited in claim 16, such that the structure imprinted on the pressure area of the laminating body is embossed into the foil. 